src/test/test-unaligned.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd
   4
   5   Copyright 2014 Tom Gundersen
   6
   7   systemd is free software; you can redistribute it and/or modify it
   8   under the terms of the GNU Lesser General Public License as published by
   9   the Free Software Foundation; either version 2.1 of the License, or
  10   (at your option) any later version.
  11
  12   systemd is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   Lesser General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  19 ***/
  20
  21 #include "sparse-endian.h"
  22 #include "unaligned.h"
  23 #include "util.h"
  24
  25 static uint8_t data[] = {
  26         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
  27         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
  28 };
  29
  30 static void test_be(void) {
  31         uint8_t scratch[16];
  32
  33         assert_se(unaligned_read_be16(&data[0]) == 0x0001);
  34         assert_se(unaligned_read_be16(&data[1]) == 0x0102);
  35
  36         assert_se(unaligned_read_be32(&data[0]) == 0x00010203);
  37         assert_se(unaligned_read_be32(&data[1]) == 0x01020304);
  38         assert_se(unaligned_read_be32(&data[2]) == 0x02030405);
  39         assert_se(unaligned_read_be32(&data[3]) == 0x03040506);
  40
  41         assert_se(unaligned_read_be64(&data[0]) == 0x0001020304050607);
  42         assert_se(unaligned_read_be64(&data[1]) == 0x0102030405060708);
  43         assert_se(unaligned_read_be64(&data[2]) == 0x0203040506070809);
  44         assert_se(unaligned_read_be64(&data[3]) == 0x030405060708090a);
  45         assert_se(unaligned_read_be64(&data[4]) == 0x0405060708090a0b);
  46         assert_se(unaligned_read_be64(&data[5]) == 0x05060708090a0b0c);
  47         assert_se(unaligned_read_be64(&data[6]) == 0x060708090a0b0c0d);
  48         assert_se(unaligned_read_be64(&data[7]) == 0x0708090a0b0c0d0e);
  49
  50         zero(scratch);
  51         unaligned_write_be16(&scratch[0], 0x0001);
  52         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint16_t)) == 0);
  53         zero(scratch);
  54         unaligned_write_be16(&scratch[1], 0x0102);
  55         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint16_t)) == 0);
  56
  57         zero(scratch);
  58         unaligned_write_be32(&scratch[0], 0x00010203);
  59         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint32_t)) == 0);
  60         zero(scratch);
  61         unaligned_write_be32(&scratch[1], 0x01020304);
  62         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint32_t)) == 0);
  63         zero(scratch);
  64         unaligned_write_be32(&scratch[2], 0x02030405);
  65         assert_se(memcmp(&scratch[2], &data[2], sizeof(uint32_t)) == 0);
  66         zero(scratch);
  67         unaligned_write_be32(&scratch[3], 0x03040506);
  68         assert_se(memcmp(&scratch[3], &data[3], sizeof(uint32_t)) == 0);
  69
  70         zero(scratch);
  71         unaligned_write_be64(&scratch[0], 0x0001020304050607);
  72         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint64_t)) == 0);
  73         zero(scratch);
  74         unaligned_write_be64(&scratch[1], 0x0102030405060708);
  75         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint64_t)) == 0);
  76         zero(scratch);
  77         unaligned_write_be64(&scratch[2], 0x0203040506070809);
  78         assert_se(memcmp(&scratch[2], &data[2], sizeof(uint64_t)) == 0);
  79         zero(scratch);
  80         unaligned_write_be64(&scratch[3], 0x030405060708090a);
  81         assert_se(memcmp(&scratch[3], &data[3], sizeof(uint64_t)) == 0);
  82         zero(scratch);
  83         unaligned_write_be64(&scratch[4], 0x0405060708090a0b);
  84         assert_se(memcmp(&scratch[4], &data[4], sizeof(uint64_t)) == 0);
  85         zero(scratch);
  86         unaligned_write_be64(&scratch[5], 0x05060708090a0b0c);
  87         assert_se(memcmp(&scratch[5], &data[5], sizeof(uint64_t)) == 0);
  88         zero(scratch);
  89         unaligned_write_be64(&scratch[6], 0x060708090a0b0c0d);
  90         assert_se(memcmp(&scratch[6], &data[6], sizeof(uint64_t)) == 0);
  91         zero(scratch);
  92         unaligned_write_be64(&scratch[7], 0x0708090a0b0c0d0e);
  93         assert_se(memcmp(&scratch[7], &data[7], sizeof(uint64_t)) == 0);
  94 }
  95
  96 static void test_le(void) {
  97         uint8_t scratch[16];
  98
  99         assert_se(unaligned_read_le16(&data[0]) == 0x0100);
 100         assert_se(unaligned_read_le16(&data[1]) == 0x0201);
 101
 102         assert_se(unaligned_read_le32(&data[0]) == 0x03020100);
 103         assert_se(unaligned_read_le32(&data[1]) == 0x04030201);
 104         assert_se(unaligned_read_le32(&data[2]) == 0x05040302);
 105         assert_se(unaligned_read_le32(&data[3]) == 0x06050403);
 106
 107         assert_se(unaligned_read_le64(&data[0]) == 0x0706050403020100);
 108         assert_se(unaligned_read_le64(&data[1]) == 0x0807060504030201);
 109         assert_se(unaligned_read_le64(&data[2]) == 0x0908070605040302);
 110         assert_se(unaligned_read_le64(&data[3]) == 0x0a09080706050403);
 111         assert_se(unaligned_read_le64(&data[4]) == 0x0b0a090807060504);
 112         assert_se(unaligned_read_le64(&data[5]) == 0x0c0b0a0908070605);
 113         assert_se(unaligned_read_le64(&data[6]) == 0x0d0c0b0a09080706);
 114         assert_se(unaligned_read_le64(&data[7]) == 0x0e0d0c0b0a090807);
 115
 116         zero(scratch);
 117         unaligned_write_le16(&scratch[0], 0x0100);
 118         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint16_t)) == 0);
 119         zero(scratch);
 120         unaligned_write_le16(&scratch[1], 0x0201);
 121         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint16_t)) == 0);
 122
 123         zero(scratch);
 124         unaligned_write_le32(&scratch[0], 0x03020100);
 125
 126         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint32_t)) == 0);
 127         zero(scratch);
 128         unaligned_write_le32(&scratch[1], 0x04030201);
 129         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint32_t)) == 0);
 130         zero(scratch);
 131         unaligned_write_le32(&scratch[2], 0x05040302);
 132         assert_se(memcmp(&scratch[2], &data[2], sizeof(uint32_t)) == 0);
 133         zero(scratch);
 134         unaligned_write_le32(&scratch[3], 0x06050403);
 135         assert_se(memcmp(&scratch[3], &data[3], sizeof(uint32_t)) == 0);
 136
 137         zero(scratch);
 138         unaligned_write_le64(&scratch[0], 0x0706050403020100);
 139         assert_se(memcmp(&scratch[0], &data[0], sizeof(uint64_t)) == 0);
 140         zero(scratch);
 141         unaligned_write_le64(&scratch[1], 0x0807060504030201);
 142         assert_se(memcmp(&scratch[1], &data[1], sizeof(uint64_t)) == 0);
 143         zero(scratch);
 144         unaligned_write_le64(&scratch[2], 0x0908070605040302);
 145         assert_se(memcmp(&scratch[2], &data[2], sizeof(uint64_t)) == 0);
 146         zero(scratch);
 147         unaligned_write_le64(&scratch[3], 0x0a09080706050403);
 148         assert_se(memcmp(&scratch[3], &data[3], sizeof(uint64_t)) == 0);
 149         zero(scratch);
 150         unaligned_write_le64(&scratch[4], 0x0B0A090807060504);
 151         assert_se(memcmp(&scratch[4], &data[4], sizeof(uint64_t)) == 0);
 152         zero(scratch);
 153         unaligned_write_le64(&scratch[5], 0x0c0b0a0908070605);
 154         assert_se(memcmp(&scratch[5], &data[5], sizeof(uint64_t)) == 0);
 155         zero(scratch);
 156         unaligned_write_le64(&scratch[6], 0x0d0c0b0a09080706);
 157         assert_se(memcmp(&scratch[6], &data[6], sizeof(uint64_t)) == 0);
 158         zero(scratch);
 159         unaligned_write_le64(&scratch[7], 0x0e0d0c0b0a090807);
 160         assert_se(memcmp(&scratch[7], &data[7], sizeof(uint64_t)) == 0);
 161 }
 162
 163 static void test_ne(void) {
 164         uint16_t x = 4711;
 165         uint32_t y = 123456;
 166         uint64_t z = 9876543210;
 167
 168         /* Note that we don't bother actually testing alignment issues in this function, after all the _ne() functions
 169          * are just aliases for the _le() or _be() implementations, which we test extensively above. Hence, in this
 170          * function, just ensure that they map to the right version on the local architecture. */
 171
 172         assert_se(unaligned_read_ne16(&x) == 4711);
 173         assert_se(unaligned_read_ne32(&y) == 123456);
 174         assert_se(unaligned_read_ne64(&z) == 9876543210);
 175
 176         unaligned_write_ne16(&x, 1);
 177         unaligned_write_ne32(&y, 2);
 178         unaligned_write_ne64(&z, 3);
 179
 180         assert_se(x == 1);
 181         assert_se(y == 2);
 182         assert_se(z == 3);
 183 }
 184
 185 int main(int argc, const char *argv[]) {
 186         test_be();
 187         test_le();
 188         test_ne();
 189         return 0;
 190 }